Diff of the two buildlogs:

--
--- b1/build.log	2024-01-06 15:53:40.501527671 +0000
+++ b2/build.log	2024-01-06 15:54:47.342709432 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Feb  7 10:15:42 -12 2025
-I: pbuilder-time-stamp: 1738966542
+I: Current time: Sun Jan  7 05:53:43 +14 2024
+I: pbuilder-time-stamp: 1704556423
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/bullseye-reproducible-base.tgz]
 I: copying local configuration
@@ -17,7 +17,7 @@
 I: copying [./c3p0_0.9.1.2-10.debian.tar.xz]
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
-gpgv: keyblock resource '/tmp/dpkg-verify-sig.gObxWdcs/trustedkeys.kbx': General error
+gpgv: keyblock resource '/tmp/dpkg-verify-sig.0hfWpQq8/trustedkeys.kbx': General error
 gpgv: Signature made Tue Dec 25 14:34:13 2018 
 gpgv:                using RSA key ACF3D088EF32EDEF6A1A835FD9AD14B9513B51E4
 gpgv:                issuer "apo@debian.org"
@@ -33,49 +33,80 @@
 dpkg-source: info: applying CVE-2018-20433.patch
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1385383/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink02-arm64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 Jan  6 15:53 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:hostcomplete:interactive_comments:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="1" [2]="4" [3]="1" [4]="release" [5]="aarch64-unknown-linux-gnu")
+  BASH_VERSION='5.1.4(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all,-fixfilepath parallel=12 '
-  DISTRIBUTION='bullseye'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=bullseye
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='e77fad17069d477dac2d901608053ac6'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='1385383'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=737560dd6e134d539a8ae36acc696d12
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=278951
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.1r12PyBl/pbuilderrc_DxOc --distribution bullseye --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bullseye-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.1r12PyBl/b1 --logfile b1/build.log c3p0_0.9.1.2-10.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.104:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.1r12PyBl/pbuilderrc_1Nn5 --distribution bullseye --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/bullseye-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.1r12PyBl/b2 --logfile b2/build.log c3p0_0.9.1.2-10.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.104:3128
 I: uname -a
-  Linux codethink01-arm64 6.1.0-17-cloud-arm64 #1 SMP Debian 6.1.69-1 (2023-12-30) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-17-cloud-arm64 #1 SMP Debian 6.1.69-1 (2023-12-30) aarch64 GNU/Linux
 I: ls -l /bin
   total 5252
   -rwxr-xr-x 1 root root 1282512 Mar 27  2022 bash
@@ -135,7 +166,7 @@
   -rwxr-xr-x 1 root root   43880 Sep 22  2020 rmdir
   -rwxr-xr-x 1 root root   19208 Sep 27  2020 run-parts
   -rwxr-xr-x 1 root root  114016 Dec 22  2018 sed
-  lrwxrwxrwx 1 root root       4 Jan  8 15:48 sh -> dash
+  lrwxrwxrwx 1 root root       9 Jan  6 15:53 sh -> /bin/bash
   -rwxr-xr-x 1 root root   35656 Sep 22  2020 sleep
   -rwxr-xr-x 1 root root   72640 Sep 22  2020 stty
   -rwsr-xr-x 1 root root   67776 Jan 20  2022 su
@@ -161,7 +192,7 @@
   -rwxr-xr-x 1 root root    2206 Apr 10  2022 zless
   -rwxr-xr-x 1 root root    1842 Apr 10  2022 zmore
   -rwxr-xr-x 1 root root    4577 Apr 10  2022 znew
-I: user script /srv/workspace/pbuilder/1385383/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -329,7 +360,7 @@
 Get: 114 http://deb.debian.org/debian bullseye/main arm64 libhsqldb-java all 2.5.1-1+deb11u2 [1556 kB]
 Get: 115 http://deb.debian.org/debian bullseye/main arm64 liblog4j1.2-java all 1.2.17-10+deb11u1 [409 kB]
 Get: 116 http://deb.debian.org/debian bullseye/main arm64 maven-repo-helper all 1.10 [142 kB]
-Fetched 176 MB in 1s (204 MB/s)
+Fetched 176 MB in 1s (227 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package bsdextrautils.
 (Reading database ... 
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(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 17734 files and directories currently installed.)
@@ -993,7 +1024,11 @@
 fakeroot is already the newest version (1.25.3-1.1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/c3p0-0.9.1.2/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../c3p0_0.9.1.2-10_source.changes
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for bullseye
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/c3p0-0.9.1.2/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../c3p0_0.9.1.2-10_source.changes
 dpkg-buildpackage: info: source package c3p0
 dpkg-buildpackage: info: source version 0.9.1.2-10
 dpkg-buildpackage: info: source distribution unstable
@@ -1365,12 +1400,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/278951/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/1385383 and its subdirectories
-I: Current time: Fri Feb  7 10:16:39 -12 2025
-I: pbuilder-time-stamp: 1738966599
+I: removing directory /srv/workspace/pbuilder/278951 and its subdirectories
+I: Current time: Sun Jan  7 05:54:46 +14 2024
+I: pbuilder-time-stamp: 1704556486